Update GCPU to call opt_kernels instead of reference (#4558)
Update GCPU to call opt_kernels instead of reference (#4558)

* Update GCPU to call opt_kernels instead of reference

* style

Co-authored-by: Scott Cyphers <7bb9a997e5f2906b81b1e1515637af43501e2590@users.noreply.github.com>
NervanaSystems/ngraph,NervanaSystems/ngraph,NervanaSystems/ngraph,NervanaSystems/ngraph